Copyright: The copyright holder owns their work for awhile. People need to get the copyright holder’s permission to perform, record, or teach the work until the copyright secured expires.
If you have a song that is being shared without your permission, the TaikoSource.com Song Database would be a good place to set the record straight (See Yodan entry). Please note: Copyright laws differ from country to country, and it is up to the song’s copyright holder to properly obtain (register), track, and enforce their copyright.
Copyright U.S.: http://www.copyright.gov/
Copyright E.U.: http://ec.europa.eu/internal_market/copyright/index_en.htm
Copyright Japan: http://en.wikipedia.org/wiki/Copyright_law_of_Japan